The ultimate source of all energy in a terrestrial ecosystem is

a. the organic matter in all the organisms of the ecosystem.
b. water.
c. sunlight.
d. carbon dioxide.
e. ATP.


C

Biology & Microbiology

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Arrange the following electron carriers in the electron transport chain, based on their standard reduction potentials.Cytochroms a3(Fe3+) + e- ? Cytochrome a3 (Fe2+)   Eo (volts) = 0.35Ubiquinone + 2H+ + 2e- ? Ubiquinone H2                     Eo (volts) = 0.10Cytochrome a (Fe3+) + e- ? Cytochrome a (Fe2+)     Eo (volts) = 0.29Cytochrome c (Fe3+) + e- ? Cytochrome c (Fe2+)     Eo (volts) = 0.25

A. ubiquinone - cytochrome a - cytochrome a3 - cytochrome c B. cytochrome a3 - cytochrome a - cytochrome c - ubiquinone C. ubiquinone - cytochrome c- cytochrome a- cytochrome a3 D. cytochrome c - ubiquinone - cytochrome a - cytochrome a3

Biology & Microbiology

One of the greatest causes of human deaths through time has been due to

A. Giardia spp. B. Histoplasma spp. C. Trypanosoma spp. D. Plasmodium spp.

Biology & Microbiology

How did the researchers estimate that the original FOXP2 mutation happened 300,000–400,000 years ago?

A. by examining the fossil record B. They found the mutation in chimpanzee DNA. C. They found the mutation in Neandertal DNA. D. They found the mutation in 300,000-year-old human remains. E. using a molecular clock

Biology & Microbiology

What enables the pigments indigo and carmine to capture light?

a. a single hydrogen bond b. a single bond of any element c. a conjugated system d. a double oxygen bond

Biology & Microbiology